CN220700399U

CN220700399U - Printing head of three-dimensional printer and three-dimensional printer

Info

Publication number: CN220700399U
Application number: CN202322307502.6U
Authority: CN
Inventors: 刘利
Original assignee: Shenzhen Tuozhu Technology Co Ltd
Current assignee: Shenzhen Tuozhu Technology Co Ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2024-04-02
Anticipated expiration: 2033-08-25

Abstract

The utility model provides a printing head of a three-dimensional printer and the three-dimensional printer, comprising: the material guiding device comprises at least two feeding ports and a discharging port, the material guiding device defines at least two feeding channels and a discharging channel, each feeding channel is communicated with one feeding port, the discharging port is communicated with the discharging channel, and at least two feeding channels are communicated with the discharging channel; the hot end of the printer heats the stock line into a molten state material, and extrudes the molten state material to print the three-dimensional model; and the extrusion mechanism is positioned between the material guiding device and the hot end of the printer and is used for conveying the material line received from the material guiding device into the hot end of the printer. When changing the material, the wire rod can be followed extrusion mechanism and directly returned to the material guiding device, has shortened stockline travel distance, has reduced the reload time, has improved printing efficiency.

Description

Printing head of three-dimensional printer and three-dimensional printer

Technical Field

The utility model relates to the field of three-dimensional printing, in particular to a printing head of a three-dimensional printer and the three-dimensional printer.

Background

FDM (fused deposition modeling ) 3D printing is a technique for constructing three-dimensional objects by layer-by-layer printing using materials such as powdered metal or plastic based on digital models. In a specific implementation, a three-dimensional printer adopting the FDM technology is characterized in that a feeding mechanism supplies hot-melt filamentary material to a hot end, and the hot-melt filamentary material is heated to a molten state in the hot end. The hot end can extrude the material in a molten state onto the printing panel while moving along the printing path of the three-dimensional printer, and the three-dimensional object is printed layer by layer.

For multicolor 3D printing, in the printing process, the lines with different colors can be repeatedly switched, and how to shorten the switching time is a technical problem to be solved in the field.

Disclosure of Invention

The present utility model has been made in view of the above problems, and has as its object to provide a printhead for a three-dimensional printer and a three-dimensional printer which overcome or at least partially solve the above problems.

In a first aspect of the present utility model, embodiments of the present utility model disclose a printhead for a three-dimensional printer, comprising:

the material guiding device comprises at least two feeding ports and one discharging port, and defines at least two feeding channels and one discharging channel, wherein each feeding channel is communicated with one feeding port, the discharging port is communicated with the discharging channel, and the at least two feeding channels are communicated with the discharging channel;

the hot end of the printer is used for heating the stock line into a molten state material and extruding the molten state material to print the three-dimensional model;

and the extrusion mechanism is positioned between the material guide device and the hot end of the printer and is used for conveying the material line received from the material guide device into the hot end of the printer.

Optionally, the print head further comprises a print head housing, the print head housing comprises an opening for a stockline to pass through, the extrusion mechanism and the hot end of the printer are located in the print head housing, the material guiding device is detachably connected to the outside of the print head housing, and the material outlet faces the opening.

Optionally, the at least two feed inlets include at least three feed inlets, and the at least three feed inlets are distributed in a polygon, wherein each feed inlet is an apex of the polygon.

Optionally, the at least two feeding ports are located at one end of the material guiding device, and the discharging port is located at the other end of the material guiding device.

Optionally, the material guiding device further includes:

the feeding pipe buckle is arranged at the inner side of the feeding hole and is used for fixedly inserting the feeding pipe of the feeding hole in a plane vertical to the axial direction of the feeding channel.

Optionally, the material guiding device further comprises a buckle piece,

the buckle piece is embedded into the part of the inner side wall of the feeding channel, and the part, which is abutted against the feeding pipe inserted into the feeding port, of the inclined first direction is used for preventing the feeding pipe from moving towards the second direction along the axial direction of the feeding channel, the second direction faces the feeding port, and the first direction is opposite to the second direction.

Optionally, the material guiding device further includes: the feeding pipe buckle is arranged on the inner side of the feeding hole and is used for fixedly inserting the feeding pipe of the feeding hole in a plane vertical to the axial direction of the feeding channel, the feeding pipe buckle can move relative to the feeding channel in the axial direction of the feeding channel, and under the condition that the feeding pipe buckle moves to a preset position, the feeding pipe buckle abuts against the buckling piece to abut against the part of the feeding pipe so that the abutting against the part of the feeding pipe is separated from the feeding pipe.

Optionally, the inner side wall of the feeding channel further comprises a step structure, the step structure is used for being abutted to one end of a feeding pipe inserted into the feeding port, so that the feeding pipe inserted into the feeding port is prevented from moving towards a first direction along the axial direction of the feeding channel, a second direction faces the feeding port, and the first direction is opposite to the second direction.

Optionally, the material guiding device comprises a material guiding device shell, the material guiding device shell comprises a first sub-shell and a second sub-shell,

the outer side of the first sub-shell is connected with the side face of the at least two feeding pipes in the direction of approaching each other;

the inner side of the second sub-shell is connected with the side surfaces of the at least two feeding pipes in the direction away from each other;

the outer side of the first sub-housing and the inner side of the second sub-housing form the feed channel.

Optionally, the guide device housing further includes: a third sub-housing, which is arranged on the first sub-housing,

the third sub-housing surrounds the second sub-housing for securing the first sub-housing and the second sub-housing.

Optionally, the guide device housing further includes: a fourth sub-housing, which is provided with a third sub-housing,

the fourth sub-shell is located between the third sub-shell and the material pipe buckle and is used for fixing the material pipe buckle.

Optionally, the material pipe buckle is a sub-buckle, a boss is formed on one side of the fourth sub-shell close to the material pipe buckle, and the sub-buckle abuts against the boss.

Optionally, the buckle sheet is a metal buckle sheet, the metal buckle sheet is provided with a first through hole in the feeding channel, the first through hole bends towards the first direction, and the formed bending part is used as a part abutting against the feeding pipe.

Optionally, the number of the first through holes is at least two, and the first through holes are in one-to-one correspondence with the at least two feeding channels.

In a second aspect of the present utility model, an embodiment of the present utility model discloses a three-dimensional printer, comprising: the three-dimensional printer comprises a printing platform, a driving device and a printing head of the three-dimensional printer, wherein the printing head is arranged above the printing platform, and the driving device is used for driving the printing head and the printing platform to generate relative displacement.

The material guiding device of the printing head provided by the utility model comprises at least two feeding channels and one discharging channel, when the material lines need to be switched, the material lines of the extruding mechanism only need to be returned to the feeding channels, the material line returning distance is short, the material changing time is shortened, the printing efficiency is improved, and as the material guiding mechanism only has one discharging channel, the related extruding mechanism and the hot end only need one material line channel, compared with the extruding mechanism and the hot end with multiple channels, the structure complexity of the printing head is reduced, the cost is saved, and the printing head is prevented from being excessively heavy and influencing the printing.

Drawings

FIG. 1 is a schematic diagram of a three-dimensional printer system according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a three-dimensional printer system according to an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of a material guiding device of a print head of a three-dimensional printer according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a printhead of a three-dimensional printer according to an embodiment of the present utility model;

FIG. 5 is a cross-sectional view of a guide device of a printhead of a three-dimensional printer according to an embodiment of the present utility model;

FIG. 6 is an enlarged view of a portion of FIG. 5;

fig. 7 is a schematic diagram of a feed inlet of a material guiding device of a printhead of a three-dimensional printer according to an embodiment of the present utility model.

Reference numerals illustrate:

10-material rolls, 20-printing platforms, 30-three-dimensional printer printheads and 1-three-dimensional printers;

100-guiding device, 110-feeding channel, 111-feeding port, 112-feeding pipe, 120-discharging channel, 121-discharging port, 130-feeding pipe buckle, 140-buckle piece, 150-guiding device shell, 151-first sub-shell, 152-second sub-shell, 153-third sub-shell, 154-fourth sub-shell, 160-step structure, 200-printer hot end and 300-extrusion mechanism.

Detailed Description

The implementation of the technical solution of the present application is described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, there is shown a schematic structural view of a three-dimensional printer system of the present utility model; the three-dimensional printer system includes: a roll 10 and a three-dimensional printer 1, the three-dimensional printer comprising: the roll 10 is used to provide a line into the feed end of a three-dimensional printer printhead, such as the printing platform 20 and the printhead 30 of the three-dimensional printer described above.

In an embodiment of the present utility model, there may be a plurality of rolls 10, and each roll 10 may be wound with a material line of a different color or material from the other rolls 10. The print head 30 of the three-dimensional printer is disposed above the print platform 20, and the print head 30 of the three-dimensional printer heats the received wire to form a molten material, and extrudes the molten material on the print platform 20 to print out a model (print).

Further, the print head 30 of the three-dimensional printer includes a material guiding device 100, a printer hot end 200, and an extrusion mechanism 300 disposed between the material guiding device 100 and the printer hot end 200. In the feeding process of the material roll 10, the material line passes through the material guiding device 100 and then enters the extrusion mechanism 300, and the extrusion mechanism 300 provides the material line to the hot end of the printer; during the unwinding of the roll 10, the three-dimensional printer 1 cuts off the stock line in the print head, the extrusion mechanism 300 withdraws the stock line toward the roll 10, and the feeding and discharging assembly in the roll 10 rewinds the withdrawn stock line to the tray.

Alternatively, the three-dimensional printer 1 may cut the strand between the extrusion mechanism 300 and the hot end of the printer, or may cut the strand in the extrusion mechanism 300, for example, and the position where the three-dimensional printer cuts the strand is not limited in this application.

Illustratively, the three-dimensional printer 1 further includes a print panel 21, a thermal bed 22, and a base 23. The thermal bed 22 is disposed on a side of the base 23 facing the hot end of the printer, and the thermal bed 22 has a heating function. The printing panel 21 is arranged on one side of the thermal bed 22 facing the hot end of the printer, the heat of the thermal bed 22 can be conducted to the printing panel 21, and the hot end of the printer can extrude a molten material line onto the printing panel 21.

In particular implementations, the three-dimensional printer 1 may adjust the temperature of the printer hot side and the thermal bed 22, adjust the temperature of the printer hot side to heat the strands to a molten state, and adjust the temperature of the thermal bed 22 to adhere the strands extruded by the printer hot side to the print panel 21. The print head 30 of the three-dimensional printer is slidably connected with the first guide rail 31, the print head 30 of the three-dimensional printer can move along the length direction of the first guide rail 31, that is, displacement of the print head 30 of the three-dimensional printer relative to the print panel 21 along the length direction of the first guide rail 31 is achieved, the thermal bed 22 is slidably connected with the second guide rail 32, and the thermal bed 322 moves along the length direction of the second guide rail 32, that is, displacement of the print head 30 of the three-dimensional printer relative to the print panel 21 along the length direction of the second guide rail 32 is achieved, and the length direction of the second guide rail 32 is perpendicular to the length direction of the first guide rail 31. The first rail 31 is slidably connected to the third rail 33, and the three-dimensional printer can displace the print head 30 of the three-dimensional printer with respect to the print panel 21 in a direction perpendicular to the length of the second rail 32 and in a direction perpendicular to the length of the first rail 31 by moving the first rail 31 along the third rail 33. That is, the three-dimensional printer can realize relative displacement between the print head 30 and the print panel 21 of the three-dimensional printer in three mutually perpendicular directions, thereby printing a three-dimensional object.

Specifically, as shown in fig. 1, 3, and 4, the printhead 30 of the three-dimensional printer includes:

the material guiding device 100 comprises at least two feeding holes 111 and one discharging hole 121, the material guiding device 100 defines at least two feeding channels 110 and one discharging channel 120, wherein each feeding channel 110 is communicated with one feeding hole 111, the discharging hole 121 is communicated with the discharging channel 120, and the at least two feeding channels 110 are communicated with the discharging channel 120.

And a printer hot end 200 for heating the stock line into a molten state material and extruding the molten state material to print the three-dimensional model.

And the extrusion mechanism 300 is positioned between the material guide device 100 and the printer hot end 200 and is used for conveying the material line received from the material guide device 100 into the printer hot end 200.

Referring to fig. 5 and 6, in the embodiment of the present utility model, the material guiding device 100 includes at least two material inlets 111 and one material outlet 121, and the material inlets 111 and the material outlets 121 are respectively located at two ends of the material guiding device 100. The material guiding device 100 has at least two feeding channels 110 and one discharging channel 120, the discharging channel 120 is communicated with the discharging hole 121, and the two feeding channels 110 are communicated with the corresponding feeding holes 111. I.e. the wire enters the feed channel 110 through the feed opening 111 and finally the wire is output from the discharge channel 120 through the discharge opening 121.

The extrusion structure is located between the guide 100 and the printer hot side 200, receives the stockline delivered from the guide 100, and delivers the stockline into the printer hot side 200. As shown in fig. 1, the extrusion structure is directly connected to the guide 100 and the hot end 200 of the printer. The extrusion structure may include a set of extrusion wheels disposed on two sides of the stockline, where the set of extrusion wheels extrudes the stockline to generate friction force on the stockline, and the stockline is driven by rotation of the extrusion wheels to approach the printer hot end 200 due to the friction force, so as to convey the stockline to the printer hot end 200. Since there is only one discharge channel 120, the extrusion structure is also single channel, and a set of extrusion wheels consists of one driving wheel and one driven wheel.

The printer hot end 200 is connected with the extrusion mechanism 300, and can heat the material line conveyed by the extrusion mechanism 300 to form a molten material, and extrude the molten material to print a three-dimensional model. Since there is only one discharge channel 120, the printer hot side 200 is also a single line channel. Wherein the printer hot side 200 comprises, in order: heat radiation fins, a throat pipe, a heating block and a nozzle.

The stockline conveyed by the material guiding device 100 is directly conveyed to the hot end 200 of the printer through the extrusion mechanism 300, an additional feeding pipe 112 is not needed between the material guiding device 100 and the extrusion mechanism 300, and when the material is replaced, the wire can be directly returned to a feeding channel of the material guiding device 100 from the extrusion mechanism 300, so that the distance for returning the stockline is shortened, the material changing time is shortened, the printing time is shortened, and the printing efficiency is improved.

In an alternative implementation of the embodiment of the present utility model, the printhead further includes a printhead housing, the printhead housing includes an opening for the line to pass through, the extrusion mechanism 300 and the printer hot end 200 are located in the printhead housing, the material guiding device 100 is detachably connected to the outside of the printhead housing, and the material outlet 121 faces the opening.

Alternatively, the material guiding device 100 may be fixed in the printhead housing, and the opening of the housing is the feeding port of the material guiding device 100.

The printhead further includes a printhead housing within which the extrusion mechanism 300 and the printer hot side 200 are located, the extrusion mechanism 300 and the printer hot side 200 being protected by the printhead housing. The material guiding device 100 is detachably connected to the outside of the printhead housing, so that the material guiding device 100 can be conveniently detached and replaced. For example, if multicolor printing is not required, the guide 100 may be replaced with a single channel guide structure, or the guide 100 may be removed directly. An opening is formed in the printhead housing through which the line of material can pass; the discharge port 121 of the material guiding device 100 faces to the opening, so that the material line which can be conveyed by the material guiding device 100 enters into the extrusion mechanism 300 through the opening, and then enters into the hot end 200 of the printer, and the printing of the model is realized.

In an alternative implementation manner of the embodiment of the present utility model, the at least two feeding ports 111 include at least three feeding ports 111, and the at least three feeding ports 111 are distributed in a polygon, where each feeding port 111 is a vertex of the polygon.

The number of the feeding ports 111 may include at least three, that is, at least three feeding ports 111 are provided on the material guiding device 100, and the feeding ports 111 are distributed in a polygon, and each feeding port 111 is one of vertices in the polygon. So that the feed openings 111 can be closely distributed on the guide 100. For example, referring to fig. 7, the number of the feeding ports 111 may be four, and the four feeding ports 111 are distributed in a rectangular shape, and each feeding port 111 is one of the vertices of the rectangular shape.

In an alternative implementation of the embodiment of the present utility model, the at least two feeding ports 111 are located at one end of the material guiding device 100, and the discharging port 121 is located at the other end of the material guiding device 100.

The feed inlet 111 is located the one end of guider 100, and the discharge gate 121 is located the other end of guider 100 for feed inlet 111 and discharge gate 121 can follow same direction distribution, and after the stockline got into guider 100, can not take place to buckle, and extrusion mechanism 300 can use less power can pull the stockline.

In an optional implementation manner of the embodiment of the present utility model, the material guiding device 100 further includes:

the feeding pipe buckle 130 is disposed inside the feeding hole 111, and is used for fixing the feeding pipe 112 inserted into the feeding hole 111 in a plane perpendicular to the axial direction of the feeding channel 110.

At least one pipe clip 130 is provided inside the feed port 111, i.e., on the inner diameter of the feed port 111, and the pipe clip 130 may correspond to a single feed pipe 112 or may simultaneously correspond to a plurality of feed pipes 112. The feed pipe clip 130 fixes the feed pipe 112 inserted into the feed port 111 in a plane perpendicular to the axial direction of the feed channel 110 to fix the corresponding feed pipe 112.

In an alternative implementation of the embodiment of the present utility model, the material guiding device 100 further includes a button 140,

the button 140 is inserted into the inner sidewall of the feed channel 110, and is inclined to a first direction against the feed pipe 112 inserted into the feed port 111, so as to prevent the feed pipe 112 from moving in a second direction along the axial direction of the feed channel 110, the second direction being toward the feed port 111, and the first direction being opposite to the second direction.

A button 140 may be provided in the feed passage 110, the button 140 being partially inserted into an inner sidewall of the feed passage 110, another portion being inclined in a first direction to be abutted against the feed pipe 112 inserted into the feed port 111, a portion of the button 140 being inserted into the inner sidewall of the feed passage 110, and a portion being inclined in the first direction to be abutted against the feed pipe 112 inserted into the feed port 111, the feed pipe 112 being fixed in the feed port 111 to prevent the feed pipe 112 from moving in a second direction along an axial direction of the feed passage 110. The second direction faces the feed inlet 111, and in the example shown in fig. 3, the second direction is an upward direction; the first direction is opposite to the second direction, i.e. downward as seen in fig. 3. The material of the button 140 may be metal or engineering material such as nonmetal, which is not limited in the embodiment of the present utility model.

Further, when the buckle piece 140 is a metal buckle piece, the metal buckle piece is provided with a first through hole in the feeding channel 110, the size of the first through hole is matched with the outer diameter of the feeding pipe 112, the first through hole bends towards the first direction, and the formed bending part is used as a part abutting against the feeding pipe 112 so as to clamp the feeding pipe 112.

Specifically, the number of the first through holes is at least two, and the first through holes are in one-to-one correspondence with the at least two feeding channels 110, that is, one first through hole corresponds to one feeding channel 110, and only the corresponding feeding pipe 112 is fixed.

In addition, when the buckle piece 140 is provided, i.e. one end of the feeding pipe 112 is fixed, the pipe buckle 130 can move relative to the feeding channel 110 in the axial direction of the feeding channel 110, and when the pipe buckle 130 moves to a preset position, the pipe buckle 130 will abut against a portion of the buckle piece 140 abutting against the feeding pipe 112, so that the portion of the buckle piece 140 abutting against the feeding pipe 112 is further inclined in the first direction, so that the portion of the buckle piece 140 abutting against the feeding pipe 112 is separated from the feeding pipe 112, and the feeding pipe 112 is convenient to detach from the feeding hole 111. The design of the tube clasp 130 allows for easy removal of the feed tube 112.

In an alternative implementation of the embodiment of the present utility model, referring to fig. 5, the inner sidewall of the feed channel 110 further includes a step structure 160 for abutting against one end of the feed pipe 112 inserted into the feed port 111, so as to prevent the feed pipe 112 inserted into the feed port 111 from moving in the first direction along the axial direction of the feed channel 110.

A stepped structure surrounding the feed port 111 may be provided on an inner sidewall of the feed channel 110, and may abut against one end of the feed pipe 112 inserted into the feed port 111 to fix the feed pipe 112, preventing the feed pipe 112 inserted into the feed port 111 from moving in the first direction along the axial direction of the feed channel 110.

In an optional implementation manner of the embodiment of the present utility model, the material guiding device 100 further includes a limiting component, disposed between the material pipe buckle 130 and the feeding hole 111, for limiting a movement range of the material pipe buckle in an axial direction of the feeding channel 110.

In an alternative implementation of the embodiment of the present utility model, the guide 100 includes a guide housing 150, the guide housing 150 includes a first sub-housing 151 and a second sub-housing 152,

the outer side of the first sub-housing 151 is connected to the side surface of the at least two feeding pipes 112 in the direction of approaching each other;

the inner side of the second sub-housing 152 is connected to the side of the at least two feeding pipes 112 in the direction away from each other;

the outer side of the first sub-housing 151 and the inner side of the second sub-housing 152 form the feed channel 110.

The guide device 100 includes a guide device housing 150, and the guide device housing 150 may be composed of a first sub-housing 151 and a second sub-housing 152, wherein an outer side of the first sub-housing 151 is connected to a side surface of at least two feeding pipes 112 in a direction of approaching each other, that is, the first sub-housing 151 is disposed between the feeding pipes 112. The inner side of the second sub-housing 152 is connected to the side surfaces of at least two feeding pipes 112 in the direction away from each other, i.e. the second sub-housing 152 is disposed outside the feeding pipes 112 and surrounds all the feeding pipes 112, and at this time, the second sub-housing 152, the feeding pipes 112 and the first sub-housing 151 are sequentially arranged from outside to inside. The feed channel 110 may be formed by the outer side of the first sub-housing 151 and the inner side of the second sub-housing 152.

In an alternative implementation of the embodiment of the present utility model, the guiding device housing 150 further includes: the third sub-housing 153 is provided with a third sub-housing 153,

the third sub-housing 153 surrounds the second sub-housing 152 for fixing the first sub-housing 151 and the second sub-housing 152.

In the embodiment of the present utility model, the third sub-housing 153 surrounds the second sub-housing 152, and fixes the first sub-housing 151 and the second sub-housing 152 to fix the feeding channel 110, so as to ensure the stable feeding direction. And, the edge of the third sub-housing constitutes the feed port 111.

In an optional implementation manner of the embodiment of the present utility model, the limiting component includes: a fourth sub-housing 154 is provided with a third sub-housing,

the fourth sub-housing 154 is located between the third sub-housing 153 and the pipe buckle 130, and is used for limiting the movement range of the pipe buckle 130 in the axial direction of the feeding channel 110.

The guiding device housing 150 may further include a fourth sub-housing 154, where the fourth sub-housing 154 is located between the third sub-housing 153 and the material pipe buckle 130, and is respectively clamped with the third sub-housing 153 and the material pipe buckle 130, so as to fix the material pipe buckle 130.

Further, the material pipe buckle 130 is a sub-buckle, a boss is formed on a side of the fourth sub-housing, which is close to the material pipe buckle 130, and the sub-buckle abuts against the boss.

The material pipe buckle 130 is a sub-buckle, that is, the connection part of the fourth sub-shell and the material pipe buckle 130 is a female buckle, a boss is formed on one side of the fourth sub-shell, which is close to the material pipe buckle 130, and the boss is used as the female buckle and is abutted against the sub-buckle, so that the material pipe buckle 130 is clamped, and the material pipe 112 is further fixed.

It should be noted that the above-described terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Claims

1. A printhead for a three-dimensional printer, comprising:

2. The printhead of claim 1 wherein said printhead further comprises a printhead housing, said printhead housing including an opening for a line to pass through, said extrusion mechanism and said printer hot end being located within said printhead housing, said guide being removably attached to said printhead housing, said discharge opening being oriented toward said opening.

3. The printhead of claim 1 or 2 wherein said at least two feed ports comprise at least three feed ports, said at least three feed ports being distributed in a polygon, wherein each feed port is an apex of said polygon.

4. A printhead according to any one of claims 1 to 3, wherein the at least two feed ports are located at one end of the guide and the discharge port is located at the other end of the guide.

5. The printhead of any one of claims 1 to 4, wherein said guide further comprises:

6. The printhead of any one of claims 1 to 4 wherein said guide further comprises a flap,

7. The printhead of claim 6 wherein said guide further comprises: the feeding pipe buckle is arranged on the inner side of the feeding hole and is used for fixedly inserting the feeding pipe of the feeding hole in a plane vertical to the axial direction of the feeding channel, the feeding pipe buckle can move relative to the feeding channel in the axial direction of the feeding channel, and under the condition that the feeding pipe buckle moves to a preset position, the feeding pipe buckle abuts against the buckling piece to abut against the part of the feeding pipe so that the abutting against the part of the feeding pipe is separated from the feeding pipe.

8. The printhead of any of claims 1 to 7 wherein said feed channel inner side wall further comprises a step structure for abutting an end of a feed tube inserted into said feed port to prevent movement of a feed tube inserted into said feed port in a first direction along an axial direction of said feed channel, a second direction toward said feed port, said first direction being opposite said second direction.

9. The printhead of any one of claims 6 to 7, wherein the flap is a metal flap provided with a first through hole in the feed channel, the first through hole being bent toward the first direction, a bent portion being formed as a portion abutting against the feed tube.

10. The printhead of claim 9 wherein said first through holes are at least two in number and are in one-to-one correspondence with said at least two feed channels.

11. A three-dimensional printer, comprising: a print platform, a drive means and a print head as claimed in any one of claims 1 to 10, the print head being arranged above the print platform, the drive means being arranged to drive relative displacement between the print head and the print platform.